Suppression for memory leak in unit test using BookmarkBarFolderController

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing.
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1280 matching lines @@
 }
 {
    bug_49250
    Memcheck:Cond
    fun:gleUpdateFogData
    fun:gleUpdateState
    fun:_ZN8remoting11CapturerMac12CaptureRectsERKSt6vectorIN3gfx4RectESaIS3_EEP14CallbackRunnerI6Tuple1I13scoped_refptrINS_8Capturer11CaptureDataEEEE
    fun:_ZN8remoting8Capturer19CaptureInvalidRectsEP14CallbackRunnerI6Tuple1I13scoped_refptrINS0_11CaptureDataEEEE
    fun:_ZN8remoting28CapturerMacTest_Capture_Test8TestBodyEv
 }
+{
+   bug_49638
+   Memcheck:Addr4
+   fun:-[BookmarkButton isFolder]
+   fun:-[BookmarkBarFolderController openBookmarkFolderFromButtonAndCloseOldOne:]
+   fun:__NSFireDelayedPerform
+   fun:CFRunLoopRunSpecific
+   fun:CFRunLoopRunInMode
+   fun:RunCurrentEventLoopInMode
+   fun:ReceiveNextEventCommon
+   fun:BlockUntilNextEventMatchingListInMode
+   fun:_DPSNextEvent
+   fun:-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
+   fun:_ZN9CocoaTest8TearDownEv
+   fun:_ZN7testing8internal12TestInfoImpl3RunEv
+   fun:_ZN7testing8TestCase3RunEv
+   fun:_ZN7testing8internal12UnitTestImpl11RunAllTestsEv
+   fun:_ZN9TestSuite3RunEv
+   fun:main
+}